一、前言现代内燃机的零部件,要在很长的运转时间内均具有极高的可靠性。就工作条件的苛刻程度而言,现代柴油机的活塞,尤其是活塞销座和活塞顶区域,可谓首屈一指。理想的活塞材料,应当具有多种特性,但其中有些特性是相互冲突的,因此,选择材料时往往取折衷办法[1] 、[2] 。低膨胀系数型的 First, the preface The components of modern internal combustion engines, in a very long period of operation have a very high reliability. In terms of the harshness of working conditions, modern diesel piston, especially the piston pin and piston top area, can be described as second to none. Ideal piston materials, should have a variety of properties, but some of these properties are conflicting, so the choice of materials often take a compromise [1], [2]. Low coefficient of expansion